Copyable blackboard

Abstract

A copyable blackboard has: a written member on which a picture including such as characters or figures is depicted a first carrier for carrying the written member, a light source for irradiating light to the picture on a portion of the written member located at a predetermined position on the written member to generate an optical signal corresponding to the picture, a photosensitive member which receives the optical signal from the written member and produces a latent image of the picture thereon. A second carrier is provided for carrying the photosensitive member, an image developing element for developing the latent image on the photosensitive member itself or on a copy paper to obtain a copy of the picture, and a control element for controlling the first and second carriers the photosensitive member and the light source.

What is claimed is: 
     
       1. A copyable blackboard comprising: a written member on which is depicted a picture comprising data such as characters or figures;   first carrier means for carrying said written member;   light source for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture, said portion being located at a predetermined position on said written member;   photosensitive member which receives said optical signal from said written member and thereby produces a corresponding latent image of said picture;   second carrier means for carrying said photosensitive member;   image developing means for developing said latent image of said photosensitive member on the photosensitive member itself; and   control means for controlling said first and second carrier means to control feeding speeds of said written member and said photosensitive member to values determined to correspond to a preselected picture reduction ratio and to also control said image developing means and said light source.   
     
     
       2. A copyable blackboard as defined in claim 1, wherein: said written member is opaque, and light reflected therefrom is utilized to make a copy of said picture.   
     
     
       3. A copyable blackboard as defined in claim 1, wherein: said written member is a light penetrable sheet, and light which has penetrated said written member is utilized to make a copy of said picture.   
     
     
       4. A copyable blackboard as defined in claim 1, wherein: said photosensitive member is a photosensitive carbonless paper.   
     
     
       5. A copyable blackboard as defined in claim 1, wherein: said image developing means comprises a pressure roller.   
     
     
       6. A copyable blackboard as defined in claim 1, further comprising: means for transferring the developed latent image from the photosensitive member to a copy paper to produce a copy of the picture thereon.   
     
     
       7. A copyable blackboard as defined in claim 1, wherein: said photosensitive member is a diazo copy paper.   
     
     
       8. A copyable blackboard comprising: a written member on which is depicted a picture comprising data such as characters or figures;   first carrier means for movably carrying said written member;   light source means for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture, which portion is located at a predetermined position;   photosensitive means for receiving said optical signal from said written member and thereby producing a corresponding latent image of said picture;   second carrier means for movably carrying said photosensitive means;   shutter means for opening and closing a light path from said written member to said photosensitive means, provided on said light path;   image developing means for developing said latent image of said photosensitive means on the photosensitive means itself; and   control means for controlling said first and second carrier means, said image developing means and said light source means.   
     
     
       9. A copyable blackboard as defined in claim 8, wherein: said photosensitive means comprises a heat-developing-type silver salt photographic paper, and said image developing means comprises developing equipment therefor.   
     
     
       10. A copyable blackboard as defined in claim 8, wherein: said shutter apparatus comprises a mechanical shutter.   
     
     
       11. A copyable blackboard as defined in claim 8, further comprising: means for transferring the developed latent image from the photosensitive member to a copy paper to produce a copy of the picture thereon.   
     
     
       12. A copyable blackboard as defined in claim 8, wherein: said shutter apparatus comprises a liquid shutter.   
     
     
       13. A copyable blackboard as defined in claim 8, wherein: said written member is opaque, and light reflected therefrom is utilized to make a copy of said picture.   
     
     
       14. A copyable blackboard as defined in claim 8, wherein: said written member is a light penetrable sheet, and light which has penetrated said written member is utilized to make a copy of said picture.   
     
     
       15. A copyable blackboard, comprising: a written member on which is depicted a picture comprising data such as characters or figures;   first carrier means for movably carrying said written member;   first light source means for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture said portion being located at a predetermined position;   means for supplying a manuscript bearing optically determinable data onto said photosensitive member from the outside;   second light source means for irradiating light to said manuscript to generate an optical signal corresponding to said data thereon;   photosensitive means for receiving light from said second light source means which has penetrated said manuscript, thereby to produce a latent image corresponding to said optical signal;   second carrier means for movably carrying said photosensitive means;   means for supplying said manuscript onto said photosensitive member from the outside;   second light source for irradiating light to said manuscript which is supplied onto said photosensitive member;   image developing means for developing said latent image on said photosensitive means itself; and   control means for controlling said first and second carrier means, said image developing means and said first and second light source means.   
     
     
       16. A copyable blackboard as defined in claim 15, wherein: said written member is a light penetrable sheet, and light which has penetrated said written member is utilized to make a copy corresponding to said latent image.   
     
     
       17. A copyable blackboard as defined in claim 15, wherein: said photosensitive member is a photosensitive carbonless paper.   
     
     
       18. A copyable blackboard as defined in claim 15, wherein: said image developing means comprises a pressure roller.   
     
     
       19. A copyable blackboard as defined in claim 15, further comprising: means for transferring the developed latent image from the photosensitive member to a copy paper to produce a copy of the picture thereon.   
     
     
       20. A copyable blackboard as defined in claim 15, wherein: said photosensitive member is a diazo copy paper.   
     
     
       21. A copyable blackboard as defined in claim 15, wherein: said written member is opaque, and light reflected therefrom is utilized to make a copy of said picture.   
     
     
       22. A copyable blackboard as defined in claim 15, wherein: said latent image corresponds to said picture on said written member.   
     
     
       23. A copyable blackboard as defined in claim 15, wherein: said latent image corresponds to data from said manuscript.   
     
     
       24. A copyable blackboard, comprising: a written member on which is depicted a picture comprising data such as characters or figures;   first carrier means for movably carrying said written member;   first light source means for irradiating light to a picture on a portion of said written member to generate an optical signal corresponding to said picture, said portion being located at a predetermined position on said written member;   a recording member;   means for supplying an intermediate film sheet onto said recording member;   photosensitive means for receiving said optical signal from said written member and thereby producing a corresponding latent image of said picture;   second carrier means for movably carrying said photosensitive means;   image developing means for developing said latent image of said photosensitive means on said photosensitive means itself;   second light source means for irradiating light to said intermediate sheet, thereby to produce a latent image on said photosensitive means; and   control means for controlling said first and second carrier means, said light developing means and said first and second light source means.   
     
     
       25. A copyable blackboard as defined in claim 24, wherein: said written member comprises a white polyester sheet and said optical signal, generated by light reflected from said written member, is utilized to make a copy.   
     
     
       26. A copyable blackboard as defined in claim 24, wherein: said written member is a light penetrable sheet, and light which has penetrated said written member is utilized to make a copy.   
     
     
       27. A copyable blackboard as defined in claim 24, wherein: said photosensitive member comprises a photosensitive paper.   
     
     
       28. A copyable blackboard as defined in claim 24, wherein: said image developing means comprises a pressure roller.   
     
     
       29. A copyable blackboard as defined in claim 24, further comprising: means for transferring the developed latent image from the photosensitive member to a copy paper to produce a copy of the picture thereon.